Cool MateCapsule vs Case vs Module vs Shell
When to use each in English, with meaning, register, and examples.
Capsule
Top 5,000 (fairly common)C1noun
Case
Top 1,000 (very common)A2noun
Module
Top 1,000 (very common)B2noun
Shell
Top 1,000 (very common)B1noun
| Capsule | Case | Module | Shell | |
|---|---|---|---|---|
| Pronunciation | 🇬🇧 //ˈkæpsjuːl//🇺🇸 //ˈkæpsəl// | 🇬🇧 /["/keɪs/"]/🇺🇸 /["/keɪs/"]/ | 🇬🇧 /["/ˈmɒdjuːl/"]/🇺🇸 /["/ˈmɑːdʒuːl/"]/ | 🇬🇧 /["/ʃel/"]/🇺🇸 /["/ʃel/"]/ |
| Meaning | A small container for medicine or other items. | A situation or example. | A part of a larger system or a separate unit that can work by itself. | A hard outer covering of some animals, especially sea creatures. |
| Example | She took a capsule with water to relieve her headache. | Please put the documents in the case for safekeeping. | The course consists of ten core modules and five optional modules. | The turtle hid inside its shell to protect itself from predators. |
| Register | Neutral | Neutral | Neutral | Neutral |
| How common | Top 5,000 (fairly common) | Top 1,000 (very common) | Top 1,000 (very common) | Top 1,000 (very common) |
| CEFR level | C1 | A2 | B2 | B1 |
| Part of speech | noun | noun | noun | noun |
| Collocations | time capsule, medication capsule, space capsule, gelatin capsule, dry capsule | classic, textbook, typical, illustrate, show, cite, arise, occur, study, example, in somebody’s/this case, case of, case by case, a case in point, be, remain, overstate, classic, textbook, typical, illustrate, show, cite, arise, occur, study, example, in somebody’s/this case, case of, case by case, a case in point, notorious, tragic, assault, handle, investigate, work on, file, report, officer, on the case, case of, court, criminal, civil, bring, prosecute, pursue, come before somebody, come to court, go to court, in a/the case, case against, case of, a case to answer, no case to answer, the circumstances of a case, compelling, convincing, good, have, prepare, outline, exist, case against, case for, the case for the defence/defense, the case for the prosecution, the merits of a case, carrying, packing, glass, in a/the case, inside a/the case, out of a/the case, attaché, overnight, acute, chronic, advanced, diagnose, report, history, notes, records, case of | individual, compulsory, optional, do, study, complete, command, lunar, memory, add, configure, install, command, lunar, memory, add, configure, install, command, lunar, memory, add, configure, install | empty, hard, outer, have, come out of, emerge from, unexploded, spent, anti-aircraft, load, fire, fly, fall, land, fire, shock, case, concrete, burned-out, empty |
| Antonyms | expansion, unfolding, opening | sameness, uniformity | whole, entirety | core, interior, inside |
| Common mistakes | Confusing with 'capstone', which refers to a finishing stone., Using 'capsule' to refer to large containers., Mispronouncing with emphasis on the second syllable instead of the first. | Confused with 'case' as a container instead of a situation., Using 'case' without properly specifying what type of case (e.g., legal case, medical case). | Confused with 'model' which relates to a representation., Using it in informal contexts where simpler words like 'part' could suffice. | Confused with 'shelled' when referring to something that has been removed from the shell., Used inappropriately in contexts where 'case' or 'cover' would be more specific., Mispronounced as 'shelle' instead of 'shell'. |
| Usage notes | Used in medical contexts for pills and in general contexts for small containers. Avoid using in very casual settings. | Use 'case' to refer to a particular situation, especially in legal or medical contexts. It is less formal than 'instance' and more common in everyday conversation. | Used in technical contexts like education or software. It's appropriate when discussing parts of a system but may not be common in casual conversation. | Used to refer to physical shells of animals like snails and turtles or as a protective cover for eggs. Not usually used in formal writing about technology unless specifying a computer shell. |
Frequently asked questions: Capsule vs Case vs Module vs Shell
What's the difference between Capsule, Case, Module, and Shell?
Capsule: A small container for medicine or other items. Case: A situation or example. Module: A part of a larger system or a separate unit that can work by itself. Shell: A hard outer covering of some animals, especially sea creatures.
Are Capsule, Case, Module, and Shell the same CEFR level?
Capsule: C1, Case: A2, Module: B2, Shell: B1 on the CEFR scale.
Can I use Capsule, Case, Module, and Shell interchangeably?
Not always. Capsule, Case, Module, and Shell are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.